xref: /openbmc/linux/arch/x86/boot/compressed/Makefile (revision 360823a09426347ea8f232b0b0b5156d0aed0302)
1# SPDX-License-Identifier: GPL-2.0
2#
3# linux/arch/x86/boot/compressed/Makefile
4#
5# create a compressed vmlinux image from the original vmlinux
6#
7# vmlinuz is:
8#	decompression code (*.o)
9#	asm globals (piggy.S), including:
10#		vmlinux.bin.(gz|bz2|lzma|...)
11#
12# vmlinux.bin is:
13#	vmlinux stripped of debugging and comments
14# vmlinux.bin.all is:
15#	vmlinux.bin + vmlinux.relocs
16# vmlinux.bin.(gz|bz2|lzma|...) is:
17#	(see scripts/Makefile.lib size_append)
18#	compressed vmlinux.bin.all + u32 size of vmlinux.bin.all
19
20# Sanitizer runtimes are unavailable and cannot be linked for early boot code.
21KASAN_SANITIZE			:= n
22KCSAN_SANITIZE			:= n
23KMSAN_SANITIZE			:= n
24OBJECT_FILES_NON_STANDARD	:= y
25
26# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
27KCOV_INSTRUMENT		:= n
28
29targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
30	vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst
31
32# CLANG_FLAGS must come before any cc-disable-warning or cc-option calls in
33# case of cross compiling, as it has the '--target=' flag, which is needed to
34# avoid errors with '-march=i386', and future flags may depend on the target to
35# be valid.
36KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
37KBUILD_CFLAGS += -std=gnu11
38KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
39KBUILD_CFLAGS += -Wundef
40KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
41cflags-$(CONFIG_X86_32) := -march=i386
42cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
43KBUILD_CFLAGS += $(cflags-y)
44KBUILD_CFLAGS += -mno-mmx -mno-sse
45KBUILD_CFLAGS += -ffreestanding -fshort-wchar
46KBUILD_CFLAGS += -fno-stack-protector
47KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
48KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
49KBUILD_CFLAGS += -Wno-pointer-sign
50KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
51KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
52KBUILD_CFLAGS += -D__DISABLE_EXPORTS
53# Disable relocation relaxation in case the link is not PIE.
54KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
55KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
56
57# sev.c indirectly inludes inat-table.h which is generated during
58# compilation and stored in $(objtree). Add the directory to the includes so
59# that the compiler finds it even with out-of-tree builds (make O=/some/path).
60CFLAGS_sev.o += -I$(objtree)/arch/x86/lib/
61
62KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
63GCOV_PROFILE := n
64UBSAN_SANITIZE :=n
65
66KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
67KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
68# Compressed kernel should be built as PIE since it may be loaded at any
69# address by the bootloader.
70LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
71ifdef CONFIG_LD_ORPHAN_WARN
72LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
73endif
74LDFLAGS_vmlinux += -z noexecstack
75ifeq ($(CONFIG_LD_IS_BFD),y)
76LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments)
77endif
78ifeq ($(CONFIG_EFI_STUB),y)
79# ensure that the static EFI stub library will be pulled in, even if it is
80# never referenced explicitly from the startup code
81LDFLAGS_vmlinux += -u efi_pe_entry
82endif
83LDFLAGS_vmlinux += -T
84
85hostprogs	:= mkpiggy
86HOST_EXTRACFLAGS += -I$(srctree)/tools/include
87
88sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__start_rodata\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
89
90quiet_cmd_voffset = VOFFSET $@
91      cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
92
93targets += ../voffset.h
94
95$(obj)/../voffset.h: vmlinux FORCE
96	$(call if_changed,voffset)
97
98$(obj)/misc.o: $(obj)/../voffset.h
99
100vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \
101	$(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
102	$(obj)/piggy.o $(obj)/cpuflags.o
103
104vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
105vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
106ifdef CONFIG_X86_64
107	vmlinux-objs-y += $(obj)/ident_map_64.o
108	vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o
109	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/mem_encrypt.o
110	vmlinux-objs-y += $(obj)/pgtable_64.o
111	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev.o
112endif
113
114vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
115vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/tdx-shared.o
116vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o
117
118vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
119vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o
120vmlinux-libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
121
122$(obj)/vmlinux: $(vmlinux-objs-y) $(vmlinux-libs-y) FORCE
123	$(call if_changed,ld)
124
125OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
126$(obj)/vmlinux.bin: vmlinux FORCE
127	$(call if_changed,objcopy)
128
129targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
130
131# vmlinux.relocs is created by the vmlinux postlink step.
132$(obj)/vmlinux.relocs: vmlinux
133	@true
134
135vmlinux.bin.all-y := $(obj)/vmlinux.bin
136vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs
137
138$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
139	$(call if_changed,gzip)
140$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE
141	$(call if_changed,bzip2_with_size)
142$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
143	$(call if_changed,lzma_with_size)
144$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE
145	$(call if_changed,xzkern_with_size)
146$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
147	$(call if_changed,lzo_with_size)
148$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
149	$(call if_changed,lz4_with_size)
150$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
151	$(call if_changed,zstd22_with_size)
152
153suffix-$(CONFIG_KERNEL_GZIP)	:= gz
154suffix-$(CONFIG_KERNEL_BZIP2)	:= bz2
155suffix-$(CONFIG_KERNEL_LZMA)	:= lzma
156suffix-$(CONFIG_KERNEL_XZ)	:= xz
157suffix-$(CONFIG_KERNEL_LZO) 	:= lzo
158suffix-$(CONFIG_KERNEL_LZ4) 	:= lz4
159suffix-$(CONFIG_KERNEL_ZSTD)	:= zst
160
161quiet_cmd_mkpiggy = MKPIGGY $@
162      cmd_mkpiggy = $(obj)/mkpiggy $< > $@
163
164targets += piggy.S
165$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
166	$(call if_changed,mkpiggy)
167